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公开(公告)号：US2621261A
公开(公告)日：1952-12-09
申请号：US15388850
申请日：1950-04-04
Applicant: ERICSSON TELEFON AB L M
Inventor： ELIS KARLSSON STURE , LENNART SKOG STIG RUNE
IPC: H04R9/10
CPC classification number: H04R9/10
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